Why does half the screen or a small window flash on and off?

Why when at a website, is there a small window on my screen that keeps flashing on and off? On the small window screen I can see some computer code in black, green or red type. This happens when I open Internet Explorer.

When I open Google Crome it's like the bottom half of the page is flashing. Sometimes there's a flash of computer code. There's a faint line sometimes dividing the top and bottom halves. The top half stays in one place mostly. I recently had the computer fixed. It seems okay.

If potential threats are detected, ensure that Quarantine is selected as the Action for all the listed items, and click the Apply Actions button.If your MBAM log indicates "No action taken". That's usually a result of NOTclicking the Apply Actions button after the scan. In most cases, a restart will be required.If you misplace your log, here are ways to find.http://i.imgur.com/U9IqcVj.gifhttp://i.imgur.com/zHMG6J9.gifhttp://i.imgur.com/ZZ1trsv.gifhttp://i.imgur.com/LL0K3qs.gifOr,(Export log to save as txt) After the restart once you are back at your desktop, open MBAM once more. Click on the History tab > Application Logs. Double click on the scan log which shows the Date and time of the scan just performed. Click 'Export'. Click 'Text file (*.txt)' In the Save File dialog box which appears, click on Desktop. In the File name: box type a name for your scan log. A message box named 'File Saved' should appear stating "Your file has been successfully exported". Click Okhttp://i.imgur.com/LNl3Sgw.gifhttp://i.imgur.com/xGJgawB.gif

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